This has been sort of covered, but not along these lines before. It will happen via a terrible war and a group will take power so that we live in
"peace".
I would have to go with either number 5 or number 7 personally.
Or maybe both.
An economic crash I think would be easy for them to orchestrate,
without any bloodshed.
I think the rebirth after a natural disaster is a good canditate, who
know maybe they could manipulate a natural disaster and then step
in and say, look wer'e the only ones that can help.
This is all assuming that a New World Order actually exsists of course.